CellValue class for transporting cell timestamp with cell value simultaneously
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Key: HBASE-489
URL: https://issues.apache.org/jira/browse/HBASE-489
Project: Hadoop HBase
Issue Type: Bug
Reporter: Bryan Duxbury
Priority: Minor
All of the get* methods take a timestamp parameter that means "at least as old
as X". This is handy for getting data that fits your expectations about when it
should exist. However, the result you get back doesn't actually contain the
real timestamp the cell was stored at.
For example, let's say you write the stock price for your favorite company into
row "YHOO" at cell "stock:price". It takes the default timestamp of right now.
Then, a day passes. You want to get the most recent stock price for YHOO, and
also when the price was gathered. In the current system, you couldn't do this
at all without also doing a scan at the same time.
If we added a new class called CellValue that contained the byte[] cell value
as well as the long timestamp of when it was stored, we could return an
instance of this class wherever we used to return just the byte[]. This could
be used in all the get() methods, getRow, getClosestAtOrBefore, etc. This has
the advantage of making timestamp into a first-class citizen in HBase, which it
hasn't been so far.
Thoughts?
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